Pulverizing-mill.



W. H. LIP-BER.

PULVERIZING MILL.

APPLICATION FILED DEG. 24,1909.

0 l 9 1 9 g u A d 8 u n B t a P.

INVEN'T'D WITNESEEIE g1 I), I 1

AQfl/um ATTEJ N EY- WILLIAM H. LIEBER, 0F MILNAUKEE, WISCONSIN, ASSIGNOR TO ALLIS-CHALMERS GQM'IPAINY, OF MILWAUKEE, WISCONSIN, A UGRPOZRATION OF NIEXV JERSEY.

TPULVERIZING-MILL To all whom it may concern:

Be it known that I, \ViLLIAi/i H. Linens, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of \Visconsin, have invented a certain new and useful Improvement in Pulverizing-Mills, of which the following is a specification.

This invention relates to improvements in the construction of crushing or pu verizing mills in which material is crushe by the impact of several rolls traveling upon an annular track or ring die.

The object of the invention is to produce a pulverizing mill having a series of rolls traveling upon an annular die, which will be simple in construction and eflicient in its operation.

In mills of the above described type it is an essential feature to have the connections between the rolls and their driving shaft as flexible as possible so that any one roll of. the series is free to adjust itself relative to the ring die without greatly disturbing the position of the other rolls. This flexibility between driving and driven members prevents undue stresses from falling upon the driving parts of the nill, and is a feature.

of the present invention. I

A clear conception of the invention can be obtained by referring to the accompanying drawing in which like reference characters designate the same or similarp'arts in different views. 1

Figure 1 is a vertical section of a pulverizing mill built according to the invention, the section being taken along the line I-I of F ig'. 2. Fig. 2 is a horizontal section through the driving members, the pan and one of the rolls, of the mill shown inFig. 1, the section being taken along the line 11-11 of Fig. 1. i p

The mortar 35 of the pulverizing mill is circular in form and supports the concentric, annular die 3. The discharge screens 30 are fastened to the outer wall of the mortar 35 and form nearly a complete circle surrounding the annular die 3. The casing -:i is cylindrical in form and is supported by the mortar 35 above the screens 30. The main driving shaft 14 is supported concern trio with the mortar 35 and casingt by a boss 31 formed in one withthe mortar 35, and a thrust bearing 38, at the lower end of I the shaft 14;. The driving shaft 14 is thus Specification of Letters Patent. Patented Aug. 9, 191.0. Application filed December 24, 1909. Serial No. 534,835.

sleeve 16 is slidably mounted upon the shaft 14 and splines 15. Pins 11 are formed coaxial with each other and in one piece with the sleeve 16, the pins 11, being radial to the shaft 14; and having sections of dif ferent diameters. The sections of the pins 11, having the larger diameters, are formed nearest the ,sleeve 16. Bushings 12, which surround the sections of the pins 11 of smaller diameter, shoulder against the sections of thepins 11 of larger diameter.

The bushings 12 surrounding the ins 11, are clamped between the upper an lower halves of the connecting piece or ring 17,

by clamping bolts 18 passingthrough the ring 17. Bushings 12, surrounding the pin 10 and shaft 9, are similarly clamped between the halves of the ring 17, by bolts 18. The .pin. 10 and shaft .9 are coaxial, their axes intersecting the common axis of the pins 11 at any angle, preferably at right an les as shown.

The pin 10 has an enlarged section 2t) which-shoulders against the bushing 12. and

the ring--17 on one side, and against the main driving head 6 on the opposite side of the section 20. The portion of the pin 10 beyond the enlarged section 20 is clamped between the driving head 6 and thecap22 by clamping bolts 36, a second enlarged section 25 at the outer end of the pin 1() preventing the pin 10 from sliding endwise.

The shaft 9 has an enlarged section 120 which coacts with the bushing 12, ring 17, and driving head 6, in a manner similar to the coaction of the enlarged section 20 of the pin 10 with these members. A second enlarged section 121 on the shaft 9 prevents the shaftQ from sliding endwise under the cap 7, which cap 7 clamps the shaft 9 to the driving head 6 by means of clamping bolts 7 8. The end of the shaft 9 projects beyond the driving head 6, .andhas a crushing roll 1 mounted thereon concentrically therewith. The roll 1 is revented from sliding longitudinally on the shaft 9 by an enlarged secrolls 1.

'tion 91 at the outer end of the shaft 9, but

is free to rotate about the shaft 9. The roll 1 is surrounded by a wearing ring 2 which is fastened to the roll 1 by shrinking or other suitable means, and which ring 2 rests upon the upper surface of the annular die 3 in the mortar 35. The shafts 13 are also clamped between caps 7 and the head 6 by means of bolts 8, but do not project beyond the head 6 on the inner .side thereof. The portions of the shafts 13 which project beyond the outer limits of the head 6, are exactly the same as the outward projecting portion of the shaft 9. Rolls 1, having Wearing rings 2, are mounted on the projecting ends of the shafts 13 and rest upon the annular die 3 within the mortar 35. There may be any number of rolls 1 mounted on shafts clamped to the head 6, three rolls, as shown, being the preferred form of mill.

The feed hopper 23 is fixed to the upper portion of the shaft 14 above the splines 15, by means of dowels, short keys or in any other suitable manner. Discharge spouts 5 I project from the hopper 23 to points above the annular die 3, so that any material leaving the hopper 23 through a spout 5, will fall upon the annular die 3 between two adjacent rolls 1 resting on the die 3.

The mechanisms for controlling the feed to the hopper 23, and for lubricating the various bearings of the mill,*; may be 0 any suitable type, and have been 'omitted from the drawings, since they form no part of the present invention.

In the operation of the mill, the main driving shaft 14 is given a rotary motion by means of the power, not shown, connected to the gear 32. This rotary motion of the shaft 14 is transmitted to the rolls 1 through the splines 15, sleeve 16, pins 11, ring 17, pins 10 and shaft 9, head 6 and shafts 9, 13, causing them to roll upon the annular die 3. The material to be pulverizedis admitted to the hopper 23, which hopper 23 being fastened to the shaft 14 is also rotating with said shaft 14. From the hopper 23 the uncrushed material is passed to the annular die 3, through the discharge spouts 5, falling in the path of the crushing After the rolls 1 have, by their repeated rolling over the material, reduced same so that it may pass through the screens 30, the pulverized material is discharged through the screens 30, and fresh material is supplied from the hopper 23 through the spouts 5. I. v

It will be seen that if the rolls 1 were connected with the shaft 14 by rigid driving connections, it would be necessary to maintain an equal amount of material above the annular die 3 at each of the contactpoints of the rolls 1 therewith. If this were not done, the accumulation of material under one roll 1, above the amount under another'roll 1, would produce an upward twist in the driving connection between the first roll and the shaft 14, thus producing an intense stress in the connection. With the present construction such stresses cannot occur. If the material is unevenly distributed over the annular die 3, the rolls 1 will adjust themselves to any such unevenness, due to the universal driving connection between the head 6 and the sleeve 16. If material enough is placed upon. the die 3 to raise all of the rolls an equal amount, the entire driving mechanism of the rolls will move up with the sleeve 16 on the shaft 14.

A universally flexible connection is formed between the head 6 and the sleeve 16, as the four pins 9, 10, 11, will allow the head 6 to be shifted to any angular position, relative to the sleeve 16, within certain limits determined by the sizes of the head 6, ring 17 and sleeve 16. The flexibility of the driving conncctionsas shown in the present invention is, moreover, a compact construction since all of the bearing boxes of the driving pins are confined to the ring 17, the shafts 9, 13, and the pin 10 being rigidly connected to the head 6 and the pins 11, being rigidly connected to the sleeve 16. A single series of means for transmitting power from the shaft 14 to the driving head 6 and for permitting wabbling of the head about the shaft 14 is established by having the elements which serve as the driving means also serve as the means for permitting wabbling. The connecting piece or ring 17 can be easily removed by withdrawing the bolts 18 therefrom, thus leaving the shaft 14 and sleeve 16 disconnected from the driving head 6. This feature also gives easy access to the bearings for inspection and repairs. The head 6 can have no parallel side movement in the mill, since the shoulders on the pins 10, 11, and the shaft 9, coacting against,t-he ring 17 and bushings 12, keep the head 6 concentric with the shaft 14.

It should be understood that it is not desired to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

It is claimed and desired to secure by Letters Patent,

1. In a pulverizin mill, 3 pluralit of rolls, a driving head, a driving sha a spline coacting with said shaft, a shaft fixed to said driving head for mounting each of said rolls, and a single series of means connecting said spline and said driving head, said series of means being adapted to transmit power and to permit wabbling of said head, and said series of means being longi-v tudinally movable relative tosaid driving shaft.

2. In a pulverizin mill, a lurality of rolls, a driving head or said rol s, a driving shaft for said head, a sleeve, a driving connection between said sleeve and shaft permitting sliding of said sleeve on said shaft, and -a single series of means connecting said sleeve and said driving head, said series of means being adapted to transmit power and permitting wabbling of said head.

3. In a pulverizing mill, a driving shaft, a spline coacting with said shaft, a driving head, a plurality of rolls associated with and rotatable relative to said head, and a single series of means connecting said spline and said driving head, said series of means being adapted to transmit power and to permit wabbling of said head, and said series of means beingadapted to move longitudinally relative to said shaft.

4. In a pulverizing mill, a driving shaft, a ring, a driving head, a plurality of rolls associated with and rotatable relativie to said head, means interposed between said driving shaft and said ring for allowing relative motion between said shaft and. said ring, and a second means interposed between said ring and said driving head for allowin relative motion between said ring and sai head.

5. In a pulverizing mill, a driving shaft, a sleeve slidably mounted on said shaft, a ring surrounding and swiveled on said sleeve, gle to the swivel between said ring and sleeve, and a plurality of rolls mounted on said head.

6. In a pulverizing mill, a driving shaft, a sleeve slidably' mounted on said shaft, 2 driving head concentric with said shaft and said sleeve, a driving connection between said sleeve and said head, said connection being adapted to allow wabbling of said head, and a plurality of rolls rotatably mounted on said head.

-7. In a pulverizing mill, a driving shaft and a driving head, a pin for driving said head, said pin being fixed to said head and a head swiveled 'onsaid ring at an anprojecting toward said shaft, a second pin projectin toward said head and driven from sai shaft, means connecting the projecting ends of said pins, and a plurality of rolls rotatabl mounted on said head.

' 8. In a pn verizing 'mill, a driving shaft, a sleeve slidably mounted on said shaft, and a driving head, a pin projecting toward said shaft for driving said head, a second pin projecting toward said head and driven from said shaft, a ring connecting said pins and providing bearings therefor, and a plurality of rolls rotatably mounted on said head.

9. In a pulverizing mill, a driving shaft, a spline coacting with said shaft, a driving head, rolls rotatably mounted on said head, and a positive driving connection between said spline and said head, including means for maintaining said head concentric with said shaft and for permitting wabbling of said head, said connection being longitudinally movable relative to said shaft.

10. In a pulverizing mill, a rotatable driving means, a driving head, a plurality of rolls rotatably mounted on said head, a connecting piece, a pivotal connection between said connecting piece and said driving means, and 'a pivotal .connection between said connecting piece and said driving head.

. 11. In a pulverizing-mill,a rotatable driv- I mg means, a driving head, a plurality of rolls rotatably mounted on said head, a connecting piece, a pivotal connection between said connecting piece and said driving means, and a pivotal connection between said connecting pieceand said driving head, said pivotal connections being formed in said connecting piece. I

In" testimony whereof, I afiix my signature in the presence "of two witnesses.

. WILLIAM H. LIEBER. Witnesses r G. F. DE WEI-N, JoHN. DAY, Jr. 

